Table 8. Result of multivariate Regression Analysis.

Independent Variables	Unstandardized Coefficients		Standardized Coefficients	T	p	VIF
	B	SE	Beta
(Constant)	−3.837	8.066		−0.476	0.635
Good self-prognosis on work ability	−5.675	2.662	−0.116	−2.132	0.034	1.353
Mental disorder	11.002	2.756	0.202	3.991	0.000	1.181
Impairment prior to treatment	0.205	0.048	0.213	4.251	0.000	1.151
Rheumatoid arthritis	9.368	3.343	0.141	2.802	0.005	1.158
Duration of complaints ≥½ year	8.378	2.213	0.192	3.786	0.000	1.177
Age	0.218	0.097	0.111	2.256	0.025	1.117
White collar worker	−6.233	2.112	−0.141	−2.951	0.003	1.048
Physically active	−4.733	2.126	−0.107	−2.226	0.027	1.064
Body mass index	0.379	0.218	0.086	1.743	0.082	1.123

Dependent variable: Impairment 6 months after therapy.